An alternative method of making WM5 ask where to install a program is by adding the “/askdest” option to the Windows CE loader:
HKCR\cabfile\Shell\open\command = ‘wceload.exe “%1″ /askdest’ (REGSZ string, no quotes)

Change the location of My Documents

Documents are opened in and saved to the device’s internal storage by default. You can change this location to, for example, your Storage Card:

Change the location of Temporary Internet Files
When browsing the web, pages and images are saved in the ‘Temporary Internet Files’ location. You can change this location to, for example, your Storage Card:

HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders\Cache = “\Storage Card\cacheie” (REG_SZ string, no quotes)
To return to the original location: